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发明名称
Sound reproducing system
摘要
申请公布号
US2018466(A)
申请公布日期
1935.10.22
申请号
US19320647510
申请日期
1932.12.16
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
O'NEIL HORACE T.;DUNN HUGH K.
分类号
G11B7/00
主分类号
G11B7/00
代理机构
代理人
主权项
地址
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